| The 21st century is an era of ocean development during which the academic field other walks of life should focus their attention to the sustainable development of the coastal area. The ocean contributes a lot to the sustainable development of the coastal area and even the whole nation in the aspects of society, economy and culture. So systematically analyzing the extent and mechanism of the contribution is not only theoretically significant but also practically significant. Based on the summary of the relative study and theories, this paper mainly probes into the problems as follow: (1) the contradiction between the quickening development of coastal area and shortage of the natural resource. The development of the coastal area is seriously restricted by the lack of such resources as fresh water, land, mine, energy and etc;(2)The contribution of the ocean to the sustainable development of the coastal area. Sea makes much contribution to the development of the coastal area in the fields like resource supply, economic development, society development and ecological system and environment. (3)The quantitative analysis of the sustainable development of coastal area; (4)The analysis of the mechanism of the contribution. The contribution made by the sea is a necessary result of the evolution of the whole oceanic ecological system. It embodies the flows of matter, energy and information brought on by the open nature of the system. And it is also the consequence of the pulling of the mankind demand. And at the end, this paper puts forward several suggestions about how to maintain the sustainable contribution of the ocean to the development of the coastal area. We propose that a new concept of ocean be erected, the comprehensive management be conducted and the overall oceanic development program be established, perfect the system of law and regulation concerned with sea, step up the development of oceanic technology and bring up a group of technological talents.
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